It was discovered that the web interface in CUPS, the Common UNIX
Printing System, incorrectly validated permissions on rss files and
directory index files. A local attacker could possibly use this issue
to bypass file permissions and read arbitrary files, possibly leading
to a privilege escalation.

For the stable distribution (wheezy), these problems have been fixed in
version 1.5.3-5+deb7u4.

For the unstable distribution (sid), these problems have been fixed in
version 1.7.4-2.

We recommend that you upgrade your cups packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/